Probably unique iPhone 3G freezes

Ok, i'm gonna explain this in a lot of detail, so, if you don't like detailed threads, press your browser's "Back" button.
I have a pre-3GS iPhone 3G, 8GB. It wasn't mine at first, but I restored it from a backup from my iPod touch 1st generation. The iPhone currently has an Exchange account configured, as well as 3 IMAP accounts, and an LDAP account. I have the phone set to fetch every hour but it generally fails because there is no data network. I do not have a data plan so I used the iPhone Configuration Utility to make a profile with an invalid APN so I can avoid using data. There is about 140 apps (I know, wow, right?), and there around 300-400MB free space right now. I have around 10 apps that have Push Notifications.
I started using the iPhone with 3.1 on it. Ever since, I have been experiencing the "mysterious shutdown," even though it is more like a freeze because the screen come on after a minute. I have also been experiencing the random freezes, and I even had a random service drop yesterday. I discovered that most of the freezing was caused by Exchange Calendar since it probably could not connect to the server and it decided to freeze the entire phone. But, recently, for troubleshooting purposes, I've had Exchange Mail turned off, and today I finally shut off Exchange Contacts. So, my Exchange account is completely off. The whole day today I had Wi-Fi turned off: that didn't help anything at all. Still was experiencing the same problems. I was still experiencing problems when my Exchange account was and still is completely off. Also, whenever the phone connects to the AT&T network, it freezes. Whenever it loses service, it freezes. Walking around school causes the phone to lose and gain service all the time. I'm pretty sure the phone hates me by now.
In my techiness and problem solving I have narrowed it down to the network, and some of the above. I have realized Airplane Mode is a good solution to the entire problem. In fact, it might be the solution. But, I'm looking for more solutions besides Airplane Mode.
What can I do to stop my freezing?

It's not just you guys. Mine just freezes completely, and after holding the power button for a while, it comes back on, or turns on the take screen shot feature. It's highly annoying!! I get network outages as well.

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